A pump core active centering and vibration isolation device for a large horizontal axial flow pump

Abstract

This invention discloses an active alignment and vibration isolation device for a large horizontal axial flow pump core, comprising at least two outer support rings, which are arranged axially around the pump core. Each outer support ring has an inner support ring on its inner side. Each inner support ring is rigidly connected to the pump core via several rigid columns, and each outer support ring is rigidly connected to the pump housing. Each rigid column has a flexible connecting pipe on its outer side, with one end connected to the pump housing and the other end connected to the inner support ring. Several air-filled vibration isolators are spaced apart between each outer and inner support ring, along the circumference of the pump core. Each air-filled vibration isolator has one end connected to the corresponding outer support ring and the other end connected to the corresponding inner support ring. The advantages of this invention are: overcoming spatial limitations, possessing active adjustment capability, real-time correction of misalignment problems, and achieving efficient vibration isolation.

Description

Technical Field

[0001] This invention relates to the field of pump core alignment technology for large horizontal axial flow pumps, specifically to an active pump core alignment and vibration isolation device for large horizontal axial flow pumps. Background Technology

[0002] Large horizontal axial flow pumps are widely used in shipbuilding, water conservancy, municipal water supply and drainage, and industrial circulating water systems. These pumps typically employ a horizontal layout, with both the inlet and outlet pipes located horizontally. The pump body is connected to the pipeline at both ends via flanges, and the weight of the entire pump and the internal medium is primarily borne by the pipeline system. The basic structure of an axial flow pump includes a pump casing and a pump core. The pump core contains all rotating parts, such as the impeller and shaft, and is entirely encapsulated within the casing.

[0003] In traditional horizontal axial flow pump structures, due to the limited space between the pump core and the pump housing, ordinary rubber vibration isolators are typically used for support and vibration isolation. However, in practical applications, the applicant has found that this traditional support and vibration isolation method for horizontal axial flow pumps exhibits significant compressive creep characteristics in the rubber vibration isolators under long-term pressure conditions. With accumulated operating time, the rubber vibration isolators are prone to a decrease in support stiffness due to creep, leading to misalignment such as pump core sinking, eccentricity, and torsion. This exacerbates wear on the seal between the inner core and the pump housing, and induces severe torsional vibration and structural noise. Furthermore, due to the limited space between the pump core and the pump housing, the structure and size of the rubber vibration isolators are restricted. As passive fixed components, they cannot be adjusted or replaced online, making it difficult to achieve optimal vibration isolation effects.

[0004] With the development of modern naval equipment, higher requirements have been placed on large horizontal axial flow pumps. On the one hand, they need greater flow rate and power; on the other hand, they require better vibration control. A major challenge in developing such large horizontal axial flow pumps is how to flexibly support the pump core and maintain its alignment. Traditional alignment structures and methods are ill-suited to the demands of high mass, high power, and high vibration reduction. To address this need, the applicant, after researching and analyzing the structural composition, operating parameters, and performance requirements of various existing large horizontal axial flow pumps, proposed a solution that uses multiple air-filled vibration isolators distributed in a ring along the pump body to support the pump core, achieving flexible support. By controlling the working pressure of each air-filled vibration isolator, the applicant can support the weight of the pump core and adjust its position to achieve alignment. However, this solution requires overcoming the limitation of the limited space between the pump core and the pump housing. To address this, the applicant further proposed designing a structure on the outside of the pump housing that is rigidly connected to both the pump core and the pump housing to complete the arrangement and installation of the airbag vibration isolator. This resulted in the application of a special device for large horizontal axial flow pumps that has active adjustment capabilities, can correct misalignment problems in real time, and achieves efficient vibration isolation. Summary of the Invention

[0005] The purpose of this invention is to provide an active alignment and vibration isolation device for the pump core of a large horizontal axial flow pump, in order to solve the technical problems existing in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An active alignment and vibration isolation device for a large horizontal axial flow pump core includes at least two outer support rings. The at least two outer support rings are respectively arranged around the pump housing of the axial flow pump along the pump core axial direction. Each outer support ring has an inner support ring on its inner side. Each inner support ring is rigidly connected to the pump core of the axial flow pump through several rigid columns. Each outer support ring is rigidly connected to the pump housing of the axial flow pump. Each rigid column is equipped with a flexible connecting pipe on its outer side, with one end of the flexible connecting pipe connected to the pump housing of the axial flow pump and the other end connected to the inner support ring. Several airbag vibration isolators are installed between each outer support ring and the inner support ring. The airbag vibration isolators and several rigid columns are located on the same cross-section and are distributed at intervals along the circumference of the axial flow pump. One end of each airbag vibration isolator is connected to the corresponding outer support ring, and the other end is connected to the corresponding inner support ring.

[0007] Furthermore, the outer support ring is equipped with several displacement sensors for real-time monitoring of the distance between the pump core and the pump housing of the axial flow pump.

[0008] Furthermore, the outer support ring is provided with several air control modules, and each air control module is connected to at least one airbag vibration isolator. It is used to control the inflation and deflation of the airbag vibration isolator according to the measurement results of the displacement sensor and adjust the working pressure of the airbag vibration isolator.

[0009] Furthermore, a limiter is provided on the mounting base of the displacement sensor to limit the radial relative displacement between the pump core and the pump housing of the axial flow pump.

[0010] Furthermore, a limit ring is provided on the rigid column to limit the axial relative displacement between the pump core and the pump housing of the axial flow pump.

[0011] Furthermore, the inner support ring is provided with a vent to release residual air inside the pump when the axial flow pump is filled with fluid.

[0012] Furthermore, a radial clearance δ is provided between the rigid column and the flexible connector to provide fluid space and displacement space when the pump core and pump housing of the axial flow pump are relatively displaced, thereby avoiding friction and collision between the rigid column and the flexible connector.

[0013] Furthermore, several airbag vibration isolators set between each outer support ring and inner support ring are evenly or unevenly distributed along the circumference of the axial flow pump, and when unevenly distributed, the airbag vibration isolators located below the axial flow pump are arranged more densely.

[0014] Compared with the prior art, the advantages of the present invention are as follows: 1. Overcoming Space Limitations: This invention extends the vibration isolation and centering adjustment structure outside the pump housing. The space outside the pump housing is used to arrange inner and outer support rings, flexible connecting pipes, and airbag vibration isolators, avoiding the problem of traditional solutions where the narrow gap between the pump core and the pump housing prevents the placement of high-performance vibration isolation components. Although the overall size and weight are increased compared to traditional built-in rubber vibration isolation solutions, the external structure achieves a significant improvement in vibration reduction performance.

[0015] 2. High-efficiency vibration isolation and superior stiffness: Compared with traditional rubber vibration isolators, the airbag vibration isolator and flexible connecting pipe used in this device have lower stiffness, which can effectively reduce the natural frequency of the system, significantly improve the vibration isolation effect, and better isolate the vibration and structural noise transmitted from the pump core to the shell.

[0016] 3. Overcoming creep and achieving active alignment: Compared to traditional rubber vibration isolators where irreversible pump core sinking and misalignment occur due to pressure creep, this invention uses an airbag vibration isolator as a support and adjustment element. Through real-time feedback from displacement sensors and independent inflation / deflation control, it dynamically compensates for shaft misalignment caused by creep, wear, hydraulic fluctuations, or thermal deformation, fundamentally solving the pain points of traditional structures that are "unable to be adjusted online or replaced".

[0017] 4. Limit Protection and Collision Prevention: By arranging limiters around the pump body, radial limiting between the pump core and the pump housing is achieved. Utilizing the large lateral stiffness of the airbag vibration isolator, the axial force generated during axial flow pump operation is effectively resisted. Combined with the limit ring inside the rigid column and flexible connecting pipe, axial limiting between the pump core and the pump housing is achieved. On the one hand, this avoids rigid collisions between the pump core and the pump housing during vibration; on the other hand, when the radial displacement exceeds the limit, the two contact to form a hard limit, effectively restricting excessive displacement of the pump core, playing a safety protection role, and improving the reliability and safety of the device operation.

[0018] 5. Anti-torsional vibration: Utilizing the large lateral stiffness of the airbag vibration isolator, the torsional vibration generated by the pump core of the axial flow pump during rotation is effectively restrained, ensuring operational stability.

[0019] 6. Clear stress distribution and convenient installation: The device does not bear the weight of the system; the weight is borne by the pipeline support. The outer support ring only serves as the mounting base for the vibration isolator. The structural stress distribution is clear, which facilitates on-site installation and maintenance.

[0020] 7. Optimize gravity load: When the airbag vibration isolators are arranged in a non-uniform manner, the lower part is arranged more densely, which fully considers the downward gravity of the horizontal axial flow pump, making the force on each airbag vibration isolator more balanced, improving the support stability and service life; when the airbag vibration isolators are arranged in a circumferentially uniform manner, the gravity support of the axial flow pump can be optimized by setting different working pressures of the airbag vibration isolators.

[0021] The innovation of this invention in providing an active alignment and vibration isolation device for a large horizontal axial flow pump core is as follows: Based on the pump casing, at least two sets of rigid support rings coaxial with the axial flow pump are arranged around the periphery of the pump casing. Each set of rigid support rings includes an inner support ring with a smaller diameter and an outer support ring with a larger diameter. The inner support ring with a smaller diameter is rigidly connected to the pump core via a rigid column, and the outer support ring with a larger diameter is rigidly connected to the pump casing via screws. A flexible connecting pipe is provided to wrap the rigid column, with its two ends connected to the pump casing and the inner support ring, respectively. The inner and outer support rings are connected by airbag vibration isolators. This forms an elastic connection between the pump core and the pump casing via the flexible connecting pipe and the airbag vibration isolators, effectively isolating the transmission of pump core vibration to the pump casing. By adjusting the working pressure of each airbag vibration isolator in real time, the supporting force of the airbag vibration isolators on the pump core is adjusted, achieving active alignment adjustment of the pump core. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this embodiment, the accompanying drawings used in the description of the embodiment will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a transverse sectional view of an embodiment of the pump core active alignment and vibration isolation device for a large horizontal axial flow pump according to the present invention. Figure 2 yes Figure 1 Sectional view of AA; Figure 3 yes Figure 1 BB section view; Figure 4 yes Figure 1 CC section view; Figure 5 yes Figure 2 Enlarged view at point M; Figure 6 This is a cross-sectional schematic diagram of a flexible connector; Figure 7 This is a simplified schematic diagram of the connection between a rigid column and a flexible hose. Figure 8This is a schematic diagram of the structure of an airbag vibration isolator; Figure 9 This is a cross-sectional schematic diagram of the inner support ring; Explanation of reference numerals in the attached drawings: 1. Outer support ring; 2. Inner support ring; 3. Rigid column; 4. Flexible connecting pipe; 5. Airbag vibration isolator; 6. Displacement sensor; 7. Pneumatic control module; 8. Limiter; 9. Limiting ring; 10. Vent; 100. Axial flow pump; 101. Pump housing; 102. Pump core; 201. Mounting hole; 401. Rubber tube; 402. Metal flange; 501. Top plate; 502. Rubber bladder; 503. Bottom plate; 504. Inflation nozzle. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this invention easier to understand, the following description, in conjunction with the accompanying drawings and specific embodiments, further explains how this invention is implemented.

[0025] See Figure 1 and Figure 2 This example illustrates an embodiment of an active alignment and vibration isolation device for a large horizontal axial flow pump provided by the present invention, comprising: two outer support rings 1, which are respectively disposed on the inlet and outlet sides of the pump housing 101 of the axial flow pump 100 along the axial direction of the pump core 102; and an inner support ring 2 is provided on the inner side of each outer support ring 1, each inner support ring 2 being rigidly connected to the pump core 102 of the axial flow pump 100 via three rigid columns 3; and each outer support ring 1 being rigidly connected to the pump housing 101 of the axial flow pump 100. Each rigid column 3 has a flexible connecting pipe 4 on its outer side, and one end of the flexible connecting pipe 4 is connected to the pump housing 101 of the axial flow pump 100, and the other end is connected to the inner support ring 2. Six airbag vibration isolators 5 are provided between each outer support ring 1 and the inner support ring 2. The six airbag vibration isolators 5 located between each outer support ring 1 and the inner support ring 2 are located on the same cross section as the three rigid columns 3 and are distributed at intervals along the circumferential direction of the axial flow pump 100. One end of each airbag vibration isolator 5 is connected to the corresponding outer support ring 1, and the other end is connected to the corresponding inner support ring 2.

[0026] Specifically, in the illustrated embodiments, see [reference]. Figure 1 and Figure 2 Each inner support ring 2 is fixed with three rigid columns 3 by screws, and they are evenly arranged along the circumference of the pump core 102 of the axial flow pump 100, that is, one column is arranged every 120°, so as to achieve circumferential support for the pump core 102 and maintain the radial distance between the pump core 102 and the pump housing 101. See also... Figure 5 Each rigid column 3 has its upper end connected to the inner support ring 2, and its lower end passes through the pre-reserved through hole on the pump housing 101 and is threadedly connected and fixed to the pump core 102 inside the pump housing 101.

[0027] Specifically, in the illustrated embodiments, see [reference]. Figure 5 and Figure 6 Each flexible connector 4 is formed by vulcanization molding of a rubber tube 401 with an aramid skeleton and metal flanges 402 located at both ends of the rubber tube 401. One end of the flexible connector 4 is sealed to the pump housing 101 via the metal flange 402, and the other end is sealed to the inner support ring 2 via the metal flange 402, thus ensuring the sealing of the fluid inside the pump. The flexible connector 4 has dual functions of sealing and vibration reduction, maintaining the pressure and sealing of the fluid inside the pump, and together with the airbag vibration isolator 5, forming a two-stage vibration reduction system to absorb and isolate the vibration energy transmitted from the pump core 102 to the pump housing 101.

[0028] Specifically, in the illustrated embodiment, countersinking was performed at the following locations to ensure installation accuracy and sealing: Firstly, the circumferential surface of the pump housing 101 is countersunk at the installation position of the flexible connector 4 to form a flat installation surface. Secondly, the circumferential surface of the inner support ring 2 is countersunk at the installation positions of the flexible connector 4 and the airbag vibration isolator 5 to form a flat installation plane. Third, the circumferential surface of the outer support ring 1 is countersunk at the installation position of the airbag vibration isolator 5 to form a flat installation plane.

[0029] The above countersinking process ensures a planar fit between the connecting components, improving installation accuracy and sealing reliability.

[0030] Specifically, in the illustrated embodiments, see [reference]. Figure 1 Each outer support ring 1 is equipped with three displacement sensors 6 for real-time monitoring of the distance between the pump core 102 and the pump housing 101 of the axial flow pump 100. More specifically, the displacement sensors 6 are eddy current displacement sensors.

[0031] Specifically, in the illustrated embodiments, see [reference]. Figure 1 Each outer support ring 1 is equipped with two pneumatic control modules 7, and each pneumatic control module 7 is connected to three airbag vibration isolators 5. These modules control the inflation and deflation of the airbag vibration isolators 5 based on the measurement results of the displacement sensor 6, adjusting the working pressure of the airbag vibration isolators 5 to achieve centering of the pump core 102. More specifically, the pneumatic control module 7 is a pneumatic regulating valve.

[0032] Specifically, in the illustrated embodiments, see [reference]. Figure 3 and Figure 4Each displacement sensor 6 is provided with a limiter 8 on its mounting base. The limiter 8 is used to limit the radial relative displacement between the pump core 102 and the pump housing 101 of the axial flow pump 100.

[0033] Specifically, in the illustrated embodiments, see [reference]. Figure 7 Each rigid column 3 is provided with two limiting rings 9, and the two limiting rings 9 are respectively located at both ends of the rigid column 3, which are used to limit the axial relative displacement between the pump core 102 and the pump housing 101 of the axial flow pump 100. More specifically, the limiting rings 9 are made of rubber.

[0034] Specifically, in the illustrated embodiments, see [reference]. Figure 2 Each inner support ring 2 is provided with a vent 10 at its top. The vent 10 is used to release the air remaining in the pump when the axial flow pump 100 is filled with fluid. The seal is tightened after the gas is released.

[0035] Specifically, in the illustrated embodiments, see [reference]. Figure 7 A radial gap δ is provided between the rigid column 3 and the flexible connector 4. This radial gap δ is used to provide fluid space and displacement space when the pump core 102 of the axial flow pump 100 and the pump housing 101 are relatively displaced, so as to avoid friction and collision between the rigid column 3 and the flexible connector 4.

[0036] When the pump core 102 and the pump housing 101 vibrate relative to each other during operation, the radial clearance δ can ensure that there is no friction or collision between the rigid column 3 and the rubber tube 401 of the flexible connector 4, thus avoiding damage to the rubber tube 401 of the flexible connector 4. When the relative radial displacement between the pump core 102 and the pump housing 101 exceeds the gap value δ, the limiting ring 9 on the rigid column 3 contacts the inner wall of the rubber tube 401 of the flexible connector 4 to form a limit, which can limit the excessive radial and axial displacement of the pump core 102 and prevent equipment damage due to excessive displacement.

[0037] Specifically, as an optional implementation method, see [link to relevant documentation]. Figure 1 The six airbag vibration isolators 5, which are set between each outer support ring 1 and inner support ring 2, are evenly distributed along the circumferential direction of the axial flow pump 100, that is, they are set at a 60° angle between two adjacent airbag vibration isolators 5.

[0038] Specifically, as another optional implementation, six airbag vibration isolators 5 disposed between each outer support ring 1 and inner support ring 2 are unevenly spaced along the circumferential direction of the axial flow pump 100.

[0039] It should be noted that, since the horizontal axial flow pump is arranged horizontally and the direction of gravity is vertically downward, in order to better bear the gravity load of the pump core 102 and make the force on each airbag vibration isolator 5 more balanced and avoid local overload, when each airbag vibration isolator 5 is evenly spaced along the circumference of the axial flow pump 100, the airbag vibration isolator 5 located below the horizontal axial flow pump adopts a higher working pressure; when each airbag vibration isolator 5 is unevenly spaced along the circumference of the axial flow pump 100, the airbag vibration isolator 5 located below the horizontal axial flow pump is arranged more densely.

[0040] It should be noted that the pump core active alignment and vibration isolation device for large horizontal axial flow pumps provided by the present invention also includes a controller (not shown in the figure). The controller is connected to the displacement sensor 6 and the pneumatic control module 7. The controller receives the measurement signal from the displacement sensor 6 and controls the pneumatic control module 7 to inflate and deflate the airbag vibration isolator 5 according to the measurement signal from the displacement sensor 6, thereby adjusting the working pressure of the airbag vibration isolator 5 to achieve pump core 102 alignment.

[0041] Specifically, in the illustrated embodiments, see [reference]. Figure 2 and Figure 8 Each airbag vibration isolator 5 includes a top plate 501, a rubber bladder 502, a bottom plate 503, and an inflation nozzle 504; wherein, the top plate 501 is located on the top of the rubber bladder 502 and is used to connect with the outer support ring 1; the bottom plate 503 is located on the bottom of the rubber bladder 502 and is used to connect with the inner and outer support rings 2; one end of the inflation nozzle 504 is connected to the rubber bladder 502 through an air tube, and the other end is connected to the air control module 7 through an air tube.

[0042] Specifically, in the illustrated embodiments, see [reference]. Figure 2 and Figure 9 Each inner support ring 2 has three mounting holes 201 evenly spaced on its circumference for mounting rigid columns 3 and flexible connecting pipes 4.

[0043] The working principle of the pump core active alignment and vibration isolation device for large horizontal axial flow pumps provided in this embodiment of the invention is as follows: 1. Active Alignment Adjustment: During the operation of the horizontal axial flow pump, when the displacement sensor 6 detects eccentricity or misalignment of the pump core 102, the controller calculates the target air pressure value required for each airbag isolator 5 according to a preset algorithm, and controls the pneumatic control module 7 to independently inflate or deflate the corresponding airbag isolator 5. Since the inner support ring 2 is rigidly connected to the pump core 102 through the rigid column 3, the pressure change of the airbag isolator 5 directly adjusts the attitude of the inner support ring 2, thereby fine-tuning the spatial position of the pump core 102 and realizing active alignment adjustment under closed-loop control.

[0044] 2. Torsional vibration suppression: Due to the large lateral stiffness of the airbag isolator 5, during the operation of the horizontal axial flow pump, when the pump core 102 generates large torsional vibration during rotation, the airbag isolator 5 can provide sufficient restoring torque to limit the excessive torsion of the pump core 102.

[0045] 3. Limit protection: During the operation of the horizontal axial flow pump, when abnormal working conditions occur and the radial or axial displacement exceeds the gap δ, the limit ring 9 on the rigid column 3 contacts the inner wall of the flexible pipe 4 to form a limit, preventing the pump core 102 from excessively deviating or colliding with the pump housing 101.

[0046] 4. Sealing and vibration reduction synergy: During the operation of the horizontal axial flow pump, the flexible connecting pipe 4 allows the rigid column 3 to make small radial and axial displacements with the pump core 102 (free movement within the gap δ range), while ensuring the sealing of the high-pressure fluid; in addition, due to its own flexible and stiffness matching design, it ensures that it works in synergy with the airbag vibration isolator 5 to avoid the formation of a rigid sound bridge.

[0047] It is important to understand that, due to the large size of the large horizontal axial flow pump, its pump core 102 is also large. To achieve a better active centering effect on the pump core 102, the active centering and vibration isolation device provided by this invention includes at least two sets of outer support rings 1 and inner support rings 2. One set is located at the inlet end of the axial flow pump, and the other set is located at the outlet end of the axial flow pump. That is, at least one outer support ring 1 and one inner support ring 2 need to be installed at both the inlet and outlet ends of the axial flow pump. Other locations between the inlet and outlet ends can be optionally equipped, and if selected, one or more sets can be installed. Furthermore, the number of rigid columns 3, flexible connecting pipes 4, airbag vibration isolators 5, displacement sensors 6, pneumatic control modules 7, and limiters 8 can be increased or decreased according to actual needs.

[0048] Finally, it should be noted that the above description is only an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A pump core active alignment and vibration isolation device for a large horizontal axial flow pump, characterized in that: It includes at least two outer support rings (1), which are arranged axially around the pump housing (101) of the axial flow pump (100) along the pump core (102) of the axial flow pump (100). Each outer support ring (1) has an inner support ring (2) on its inner side. Each inner support ring (2) is rigidly connected to the pump core (102) of the axial flow pump (100) through several rigid columns (3). Each outer support ring (1) is rigidly connected to the pump housing (101) of the axial flow pump (100). Each rigid column (3) is provided with a flexible tube (4) on its outer side, and one end of the flexible tube (4) is connected to the pump housing (101) of the axial flow pump (100), and the other end is connected to the inner support ring (2). Several airbag vibration isolators (5) are provided between each outer support ring (1) and inner support ring (2), and several airbag vibration isolators (5) and several rigid columns (3) are located on the same cross section and are distributed at intervals along the circumferential direction of the axial flow pump (100). One end of each airbag vibration isolator (5) is connected to the corresponding outer support ring (1), and the other end is connected to the corresponding inner support ring (2).

2. The pump core active alignment and vibration isolation device for a large horizontal axial flow pump according to claim 1, characterized in that: The outer support ring (1) is equipped with several displacement sensors (6) for real-time monitoring of the distance between the pump core (102) and the pump housing (101) of the axial flow pump (100).

3. The pump core active alignment and vibration isolation device for a large horizontal axial flow pump according to claim 2, characterized in that: The outer support ring (1) is provided with several air control modules (7), and each air control module (7) is connected to at least one airbag vibration isolator (5) to control the inflation and deflation of the airbag vibration isolator (5) according to the measurement results of the displacement sensor (6) and adjust the working pressure of the airbag vibration isolator (5).

4. The pump core active alignment and vibration isolation device for a large horizontal axial flow pump according to claim 2, characterized in that: The displacement sensor (6) is provided with a limiter (8) on its mounting base to limit the radial relative displacement between the pump core (102) of the axial flow pump (100) and the pump housing (101).

5. The pump core active alignment and vibration isolation device for a large horizontal axial flow pump according to any one of claims 1 to 4, characterized in that: A limiting ring (9) is provided on the rigid column (3) to limit the axial relative displacement between the pump core (102) and the pump housing (101) of the axial flow pump (100).

6. The pump core active alignment and vibration isolation device for a large horizontal axial flow pump according to claim 5, characterized in that: The inner support ring (2) is provided with a vent (10) for releasing residual air in the pump when the axial flow pump (100) is filled with fluid.

7. The pump core active alignment and vibration isolation device for a large horizontal axial flow pump according to claim 1, characterized in that: A radial clearance δ is provided between the rigid column (3) and the flexible connector (4) to provide fluid space and displacement space when the pump core (102) of the axial flow pump (100) and the pump housing (101) are relatively displaced, so as to avoid friction and collision between the rigid column (3) and the flexible connector (4).

8. The pump core active alignment and vibration isolation device for a large horizontal axial flow pump according to claim 1, characterized in that: Several airbag vibration isolators (5) set between each outer support ring (1) and inner support ring (2) are evenly or unevenly distributed along the circumference of the axial flow pump (100), and when the distribution is uneven, the airbag vibration isolators (5) located below the axial flow pump (100) are arranged more densely.

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